The Quantum Adiabatic Approximation in Chaotic Systems
نویسنده
چکیده
Quantum systems with chaotic classical counterparts cannot be treated by perturbative techniques or any kind of adiabatic approximations. This is so, in spite of the quantum suppression of classical chaos. We explicitly calculate the adiabaticity parameter for the case of a Fermi Accelerator and show that the adiabatic expansion of the evolution operator is divergent. The relevance of this situation for the understanding of quantal effects in the one body dissipation mechanism in nuclear reactions is briefly discussed. PACS numbers: 05.45.+b, 03.65.-w, 24.60.Lz, 72.15.Rn keywords: adiabatic approximation, dissipative systems, quantum chaos, quantum localization, one body dissipation. ∗corresponding author: Gonzalo Abal, Instituto de F́ısica, Facultad de Ingenieŕıa, C.C. 30, C.P. 11000, Montevideo, Uruguay. Phone: (5982) 710905/715444/715445. Fax: (5982) 711630. email: [email protected]
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